Adjustable dumbbell



FIG. 1 is an isometric view of the adjustable dumbbell in accordance with the present invention;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a top elevation view thereof;

FIG. 4 is a front plan view thereof;

FIG. 5 is a bottom plan elevation view thereof;

FIG. 6 is a rear plan view thereof; and,

FIG. 7 is a left side elevation view thereof. 

The ornamental design for an adjustable dumbbell, as shown and described. 